Rhizosphere Priming Effects on Soil Dynamics
Summary
The rhizosphere priming effect (RPE) describes the alteration in soil organic matter decomposition induced by root activity, chiefly through the release of rhizodeposits. These exudates—comprising sugars, amino acids and organic acids—fuel microbial communities, triggering shifts in the balance between carbon stabilisation and mineralisation. By modulating microbial biomass and enzyme production, RPE can accelerate the turnover of soil organic carbon (SOC), influence nutrient cycling, and affect soil structure across a range of ecosystems. Global studies reveal that RPE varies with soil texture, plant species, root architecture and environmental factors such as moisture and nutrient availability. Importantly, RPE is implicated in plant nutrient acquisition, with enhanced nitrogen and phosphorus release from microbial necromass and soil organic matter, while also posing implications for carbon sequestration under changing climates. At the aggregate scale, RPE has been shown to be size-dependent, with macro- and microaggregate dynamics influencing the extent of priming. These insights underscore the intricate interplay among roots, microorganisms and soil physicochemical properties, highlighting RPE’s central role in terrestrial biogeochemical cycles and its potential for informing sustainable land management.
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Rhizosphere Priming Effects on Soil Dynamics publication trend
The graph below shows the total number of articles in rhizosphere priming effects on soil dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Rhizosphere priming effect (RPE): The change in decomposition rate of soil organic matter induced by root activity and rhizodeposition.
Soil organic matter (SOM): The mixture of decomposed plant and microbial residues in soil, including living biomass and stabilised organic compounds.
Root exudates: Organic compounds secreted by roots, such as sugars, amino acids and organic acids, which serve as substrates for soil microorganisms.
Microbial necromass: The dead microbial biomass that contributes to soil organic matter and represents a nitrogen source upon decomposition.
Rhizodeposition: The total release of carbon and other compounds from roots into the surrounding soil, encompassing exudation, sloughed cells and mucilage.
References
- Decoupled fungal and bacterial functional responses to biochar amendment drive rhizosphere priming effect on soil organic carbon mineralization. Biochar (2024).
- A pulse of simulated root exudation alters the composition and temporal dynamics of microbial metabolites in its immediate vicinity. Soil Biology and Biochemistry (2024).
- Rhizosphere priming promotes plant nitrogen acquisition by microbial necromass recycling. Plant Cell & Environment (2024).
- Rhizosphere priming effects in soil aggregates with different size classes. Ecosphere (2020).
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